<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <MyHeader @addTodo="addTodo"></MyHeader>
      <MyList :todos="todos"></MyList>
      <MyFooter :todos="todos" @checkAll = "checkAll" @clearAllTodo="clearAllTodo"></MyFooter>
    </div>
  </div>
</template>

<script>
import pubsub from 'pubsub-js';

import MyHeader from './components/MyHeader.vue';
import MyList from './components/MyList.vue';
import MyFooter from './components/MyFooter.vue';

export default {
    name:'App',
    components:{MyHeader,MyList,MyFooter},
    data(){
      return {
        todos:JSON.parse(localStorage.getItem('todos')) || []
      }
    },
    methods:{
      addTodo(x){
        // console.log('APP组件收到数据：',x);
        this.todos.unshift(x);
      },
      //操作check
      checkTodo(id){
        this.todos.forEach((todo)=>{
          if(todo.id === id)
            todo.done = !todo.done
        })
      },
      deleteTodo(_,id){
        this.todos = this.todos.filter((todo)=>{
          return todo.id !== id
        })
      },
      checkAll(done){
        this.todos.forEach(todo => {
          todo.done = done
        });
      },
      clearAllTodo(){
        this.todos = this.todos.filter((todo)=>{
          return !todo.done
        })
      },
      updateTodo(id,newTitle){
        this.todos.forEach((todo)=>{
          if(todo.id === id)
            todo.title = newTitle
        });
      }
    },
    watch:{
      todos:{
        deep:true,
        handler(newValue){
          localStorage.setItem('todos',JSON.stringify(newValue))
        }
      }
    },
    mounted(){
      this.$bus.$on('checkTodo',this.checkTodo)
      this.$bus.$on('updateTodo',this.updateTodo)
      // this.$bus.$on('deleteTodo',this.deleteTodo)
      this.puid = pubsub.subscribe('deleteTodo',this.deleteTodo)
    },
    beforeDestroy(){
      this.$bus.$off('checkTodo')
      this.$bus.$off('updateTodo')
      // this.$bus.$off('deleteTodo')
      pubsub.unsubscribe(this.puid)
    }
}
</script>

<style>
  /*base*/
  body {
    background: #fff;
  }

  .btn {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
  }

  .btn-danger {
    color: #fff;
    background-color: #da4f49;
    border: 1px solid #bd362f;
  }

  .btn-danger:hover {
    color: #fff;
    background-color: #bd362f;
  }

  .btn-edit {
    color: #fff;
    background-color: #4185eb;
    border: 1px solid #2d7bf0;
  }

  .btn-edit:hover {
    color: #fff;
    background-color: #2d7bf0;
  }

  .btn:focus {
    outline: none;
  }

  .todo-container {
    width: 600px;
    margin: 0 auto;
  }
  .todo-container .todo-wrap {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
  }
</style>